I just opened the flag dialog intending to submit a generic mod flag, but I changed my mind about flagging and submitted a close vote instead. I never left the dialog, though; I just selected the "it doesn't belong here" option.
Usually, voting to close causes the text of the
close link to change to
close (1), but in this case no change was made. However, I am now seeing
I suspect that this is an artifact of the logic saying "when a vote to close is cast, increment the counter by the link that opened the dialog," which made perfect sense before the flag dialog was upgraded to its current feature-rich state back in January.
To be clear, this did go through properly as a close vote, and upon reload the page displays
link | edit | close (1) | flag
This bug is merely, in Grace Note's words, "a pre-refresh artifact on the page."